Water on My Basement Floor — What to Do Right Now
You just walked downstairs and found water. Take a breath — we'll walk you through exactly what to do, step by step.
DrySpace has handled 2,000+ emergency calls just like yours. You're going to be okay.
STOP: Read This Before You Step in the Water
Water and electricity are a deadly combination. If you can see standing water near electrical outlets, appliances, or your electrical panel, DO NOT ENTER.
Call 911 or your local fire department immediately if the water is near electrical sources. Do not attempt to shut off power by walking through water to reach the panel.
First 15 Minutes — Safety First
What you do in the next 15 minutes matters. Follow these steps in order. Don't skip ahead.
Don't Step in the Water if It's Near Electrical
Before you do anything, check if the water could be touching electrical outlets, appliances, or power cords. If yes, stay out.
If water is NOT near electrical sources and you can safely access your electrical panel from a dry area, proceed to step 2. If you're unsure, call for help.
Toronto Hydro Emergency: 416-542-8000 (24/7)
Turn Off Electricity to the Basement
If you can safely reach your breaker panel without walking through water, flip the breaker labeled "basement" to the OFF position.
Can't find the basement breaker? Flip the main breaker at the top to shut off power to the entire house. It's better to lose power temporarily than risk electrocution.
Important: If your electrical panel is IN the flooded basement, do not attempt to shut it off yourself. Call Toronto Hydro or an electrician immediately.
Identify the Water Type
Not all water is the same. What you do next depends on what kind of water you're dealing with:
Clear Water (Rain/Groundwater/Burst Pipe)
Least dangerous. You can handle cleanup yourself for small amounts. Still act fast — mold starts in 24-48 hours.
Grey Water (Washing Machine/Dishwasher/Sump)
Contains contaminants. Wear rubber gloves and boots. Disinfect everything after removal. Moderate health risk.
Black Water (Sewage Backup)
DO NOT TOUCH. Highly contaminated. Contains bacteria, viruses, parasites. Call professionals immediately. This is not DIY.
Stop the Source if Obvious
Can you see where the water is coming from? Here's what to do:
- • Burst pipe: Shut off the main water valve (usually near water meter or where water line enters house)
- • Running appliance: Unplug it if safe to do so (power should be off already)
- • Sump pump not working: Check if it's unplugged or if float switch is stuck
- • Water coming through walls/floor: Can't stop it yourself — foundation issue or rising groundwater
- • Floor drain backing up: Stop using ALL water in the house immediately — it's a sewer backup
✓ Okay, immediate safety handled. Now what?
If it's black water (sewage), stop here and call a professional restoration company immediately: 437-545-0067. Do not attempt cleanup yourself.
For clear or grey water, continue to the next section to understand what's causing this.
Why Is There Water on My Basement Floor?
Understanding the cause helps you know what to do next. Here are the most common reasons Toronto basements flood:
| Cause | Signs | Severity | DIY? |
|---|---|---|---|
| Heavy Rainfall + Poor Drainage | Water appears after storms, usually along walls or coming up from floor | Moderate | Partial (need exterior work) |
| Sewer Backup | Foul smell, water coming FROM floor drain, toilet gurgling | Severe | NO — Call Pro |
| Burst or Leaking Pipe | Steady flow, clear water, localized puddle near pipes | Moderate | Maybe (shut water, dry, call plumber) |
| Sump Pump Failure | Pump not running, sump pit overflowing, water during/after rain | Moderate | Check pump (may need replacement) |
| Foundation Crack | Water seeping through visible wall crack, worse during rain | Moderate | NO — Need injection repair |
| Window Well Flooding | Water pooling around/coming through basement windows | Low-Moderate | Partial (clear debris, add covers) |
| Appliance Leak | Water near washer, water heater, dehumidifier, etc. | Low | Yes (turn off, mop, fix appliance) |
| Rising Water Table | Gradual seepage (no storm), entire floor damp, happens seasonally | Severe | NO — Need waterproofing system |
Can't Figure Out the Source?
If the water seems to be coming from everywhere, appearing without rain, or you can't identify an obvious cause, you likely have a failing waterproofing system or rising groundwater. This requires professional assessment. Call 437-545-0067 for a free inspection.
How to Remove Standing Water
The method depends on how much water you're dealing with. Work fast — every hour counts for preventing mold.
Small Amount (Puddles, Less Than 1 Inch)
Tools: Wet/dry shop vac, towels, mop, buckets
Method: Use a shop vac to suck up standing water. Mop and towels for remaining moisture. Wring out towels into a bucket and dump outside. Repeat until floor feels dry to the touch.
Cost: $30-100 if you need to rent/buy a shop vac
Pro tip: Available at Home Depot, Canadian Tire. Rent for ~$40/day or buy for $80-150.
Moderate Amount (1-3 Inches)
Tools: Submersible utility pump + garden hose
Method: Get a submersible utility pump (Home Depot, Canadian Tire). Place pump in the deepest spot. Attach a garden hose and run it outside, away from your foundation (at least 10 feet). Plug in pump (ONLY if electricity is safely restored). Let it run until water is gone.
Cost: $50-150 to purchase, or $30-60/day rental
Important: If your ground is saturated from heavy rain, pump water out gradually over 2-3 hours, not all at once. Rapid removal can cause hydrostatic pressure issues on your foundation.
Significant Amount (3+ Inches or Entire Floor Covered)
Tools: Professional water extraction equipment
Method: Don't DIY this. Call a professional water removal service. They have truck-mounted extractors that can remove thousands of gallons per hour, plus industrial dehumidifiers to dry everything properly.
Cost: $2,000-5,000 (usually covered by insurance after deductible)
Call for Emergency Water RemovalSewage Backup (Any Amount)
DO NOT ATTEMPT DIY REMOVAL. Sewage contains dangerous bacteria (E. coli, Salmonella), viruses, and parasites.
Professional restoration companies have hazmat protocols, protective equipment, specialized disinfectants, and disposal methods for contaminated materials. This is not safe for homeowners to handle.
Cost: $3,000-8,000+ depending on extent (insurance typically covers)
Call Emergency Sewage CleanupAfter the Water Is Out — Critical Next Steps
Removing the water is just the beginning. These next steps prevent mold, structural damage, and insurance claim issues.
Document EVERYTHING Before Cleanup
Your insurance company needs proof of damage. Do this before you start throwing things away:
- • Take photos and videos of all damage from multiple angles
- • Show water level on walls (put a tape measure in the shot)
- • Photograph every damaged item individually — furniture, electronics, carpet, drywall
- • Save ALL receipts for cleanup supplies, equipment rental, hotel stays if needed
- • Write down the date and time flooding started
Run Dehumidifiers and Fans
Goal: Get humidity below 50% within 24 hours to prevent mold growth.
Rent or buy at least one large dehumidifier (50-70 pint capacity). Set up fans to circulate air. Open windows if weather permits. Run everything 24/7 for at least 3-5 days.
Rental cost: $40-80/day for dehumidifier. Multiple units may be needed for large basements.
Remove Wet Materials That Can't Be Saved
If these materials have been soaked for more than 24 hours, they can't be saved:
- • Carpet and underpad: Must be removed and discarded
- • Drywall: Cut and remove at least 12 inches above the waterline
- • Insulation: If wet, it won't dry and will grow mold — remove it
- • Baseboards and trim: Usually warped beyond repair — remove to dry wall cavity
Don't throw away yet! Document with photos first, and check with your insurance adjuster before disposing of large items.
Disinfect All Hard Surfaces
Mix 1 cup of bleach per gallon of water. Wear rubber gloves. Scrub all hard surfaces that were touched by water:
- • Concrete floors
- • Walls (after drywall removal)
- • Stairs
- • Any furniture you're keeping
Let bleach solution sit for 10 minutes, then rinse with clean water. Dry thoroughly.
Check Your Sump Pump
If you have a sump pump, make sure it's working:
- • Is it plugged in? (sounds obvious, but it happens)
- • Test it by pouring a bucket of water into the sump pit. The pump should turn on automatically when water rises.
- • Check if the float switch is stuck (lift it manually)
- • Make sure the discharge pipe isn't frozen or blocked
If the pump doesn't turn on or runs but doesn't pump water, it needs replacement. Don't delay — next rain could flood you again.
Call Your Insurance Company
Report the damage within 24-48 hours. Most policies require prompt notification.
When you call, have ready: your policy number, the date/time flooding started, photos of damage, description of what happened.
Important: Ask specifically if you have sewer backup coverage and overland water coverage. Standard policies often exclude these.
When to Call a Professional vs. DIY
Not sure if you need help? Here's a simple decision tree.
📞 Call a Professional Immediately If:
- • Sewage or black water (any amount)
- • Water is near electrical panel or you can't safely shut off power
- • Foundation crack is the source (needs injection repair)
- • Water keeps coming back even after you stop the source
- • More than 3 inches of standing water
- • You smell gas (call Enbridge: 1-866-383-2782, then evacuate)
- • Extensive damage (more than 100 sq ft affected)
✓ You Can Handle It Yourself If:
- • Small appliance leak (washing machine hose, water heater drip) — turn off appliance, mop up, call repair tech
- • Minor condensation or sweating pipes — dehumidifier + pipe insulation
- • Overflowing window well (clear debris, extend downspouts, consider window well covers)
- • Less than 1 inch of clean water
- • Small localized area (less than 50 sq ft)
Note: Even if you handle initial cleanup yourself, consider a professional inspection to identify the root cause and prevent future flooding.
Preventing It From Happening Again
Once you've dealt with the immediate crisis, the next step is making sure it never happens again. Here are proven solutions for Toronto homeowners.
🚰 Install a Backwater Valve
Prevents sewage from flowing back into your home during heavy storms. The City of Toronto offers a subsidy program.
Cost: $1,200-2,000 installed
Toronto Subsidy: Up to $1,250
Your net cost: As low as $0
⚙️ Upgrade Your Sump Pump
Add a battery backup system so your pump keeps working during power outages (common during Toronto storms).
New sump pump: $800-1,500
Battery backup: $500-1,200
Toronto Subsidy: Up to $1,750
🔨 Fix Foundation Cracks
Polyurethane injection creates a permanent waterproof seal. Essential first step before comprehensive waterproofing.
Cost per crack: $400-800
Timeline: Same-day repair possible
Warranty: Lifetime against leaks
🌧️ Improve Exterior Drainage
Simple fixes that make a big difference: extend downspouts 6+ feet from house, regrade soil to slope away from foundation.
Downspout extensions: $20-50 (DIY)
Regrading: $500-2,000 (pro)
Impact: Prevents 60-80% of basement flooding
🔧 Interior Waterproofing
Weeping tile system captures water after it enters foundation but before it floods your basement. Drains to sump pump.
Cost: $60-100 per linear foot
Toronto Subsidy: Up to $400
Timeline: 3-5 days installation
📋 Book a Free Inspection
Not sure which solution is right for your home? We'll inspect your basement, identify the source of water, and give you a clear plan with upfront pricing.
Schedule Free InspectionGovernment Rebates for Flood Protection
Toronto homeowners can get up to $3,400 back for installing flood protection measures. Here's what's covered:
Toronto Basement Flooding Protection Subsidy Program
Sump Pump
$1,750
Including battery backup system
Backwater Valve
$1,250
Professional installation required
Weeping Tile
$400
Interior or exterior system
Total possible rebate: $3,400
Apply within 12 months of installation. DrySpace handles the rebate paperwork for our clients — we'll walk you through the process.
Frequently Asked Questions
Quick answers to the questions you're probably asking right now.
Is water on the basement floor an emergency?
It depends. Sewage backup is always an emergency — call professionals immediately. Water near electrical panels or outlets is also an emergency — call 911 if you can't safely shut off power. For clean water from a small leak or minor seepage, it's urgent but not a 911 situation. However, you should act within hours, not days, to prevent mold growth and structural damage.
Will insurance cover basement flooding?
It depends on the cause and your specific coverage. Sudden plumbing failures (burst pipes) are usually covered by standard home insurance. However, sewer backups and overland flooding require optional endorsements that many Toronto homeowners don't have. Sewer backup coverage costs $75-200/year and is highly recommended given Toronto's aging infrastructure. Call your insurance company to understand your coverage before an emergency occurs.
How fast does mold grow after a basement flood?
Mold can begin growing within 24-48 hours in warm, humid conditions. Toronto basements, especially in summer, provide ideal conditions for rapid mold growth. This is why immediate water removal and thorough drying are critical. If you can't get humidity below 50% within 48 hours using fans and dehumidifiers, call a professional restoration company with industrial equipment. Once mold establishes, it's much harder and more expensive to remediate.
How much does it cost to fix a wet basement in Toronto?
Costs vary widely depending on the cause and extent of damage. Simple crack injection: $400-800 per crack. Sump pump installation: $800-2,500. Backwater valve: $1,200-2,000. Interior waterproofing system: $60-100 per linear foot (average basement: $5,000-8,000). Exterior waterproofing: $150-300 per linear foot (average: $15,000-25,000). Emergency water removal and restoration: $2,000-8,000+ depending on severity. Many solutions qualify for Toronto's Basement Flooding Protection Subsidy (up to $3,400).
Should I use a fan or dehumidifier after basement flooding?
Use both. Fans circulate air and help evaporation, but they don't remove moisture from the air — they just move it around. Dehumidifiers actually extract moisture from the air, lowering humidity levels. For effective drying, you need both working together. Set up fans to create airflow across wet surfaces, and position dehumidifiers centrally to pull moisture out of the air. Run both 24/7 for at least 3-5 days, or until a moisture meter shows concrete and walls are dry (typically below 15% moisture content).
Need Help Right Now?
DrySpace Waterproofing provides 24/7 emergency response for Toronto homeowners. Whether you need immediate water removal or a permanent fix to prevent future flooding, we're here to help.
Average response time: Under 2 hours for Toronto and GTA